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Use STL implementation for Beta function #3137

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Use STL implementation for Beta function #3137

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6 changes: 1 addition & 5 deletions stan/math/prim/fun/beta.hpp
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Original file line number Diff line number Diff line change
@@ -1,9 +1,6 @@
#ifndef STAN_MATH_PRIM_FUN_BETA_HPP
#define STAN_MATH_PRIM_FUN_BETA_HPP

#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/exp.hpp>
#include <stan/math/prim/fun/lgamma.hpp>
#include <stan/math/prim/functor/apply_scalar_binary.hpp>
#include <cmath>

Expand Down Expand Up @@ -51,8 +48,7 @@ namespace math {
*/
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
inline return_type_t<T1, T2> beta(const T1 a, const T2 b) {
using std::exp;
return exp(lgamma(a) + lgamma(b) - lgamma(a + b));
return std::beta(a, b);
}

/**
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